These transformers are equipped with a self-protection and disconnection device to protect the environment, property and people and prevent any disturbance of the high-voltage network from the consequences of an internal transformer fault.

Transformers covered by this standard comply with the relevant requirements prescribed in the IEC 60076 series.

The self-protected transformer may be used in conjunction with other devices to provide system coordination and sensitive system protection. The protection system is not designed to be functional when the power supply is from the low-voltage side. The self-protected transformer is not intended to function in parallel with another transformer.

NOTE This standard may be applied to transformers with a higher voltage than 24 kV or other rated power by agreement between the manufacturer and the purchaser. Validation tests should be carried out at the appropriate level.